Stratigraphic Analysis

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# Stratigraphic Analysis - PowerPoint PPT Presentation

Stratigraphic Analysis . 1. Issues of Principle The role of on-site interpretation Correlations across sequence Correlations through the sequence 2. Issues of Practice A suggested order of operations An order for considering each unit Using sequence diagrams in analysis

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## Stratigraphic Analysis

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Presentation Transcript

### Stratigraphic Analysis

1. Issues of Principle

The role of on-site interpretation

Correlations across sequence

Correlations through the sequence

2. Issues of Practice

A suggested order of operations

An order for considering each unit

Using sequence diagrams in analysis

3. The Results of Analysis

Concepts of Grouping

Diagrammatic representation

### Issues of Principle

The role of on-site interpretation:

formation processes, functions and correlations deduced on site vs. data-gathering distinct from data-analysis

Correlations across sequence (contemporaneity)

based on physical characteristics and position in sequence (site formation affects expected similarity).

Correlations through the sequence

not just physical similarity but site formation as a whole

### Issues of Practice

A suggested order of operations:

colour code according to basic descriptive criteria

correlate horizontally, distinguish between construction/occupation/ destruction

relate to previous event, hence vertical block and group plan

higher-order interpretations with rationale

An order for considering each unit

critical paths and stratigraphic nodes

Using sequence diagrams to show:

Data collection methods (e.g. section vs. plan)

‘Fuzzy’ boundaries

Basic strata types by colour (soil texture and inclusions)

### The Results of Analysis

Concepts of Grouping

lowest order is a set of actions which make up an activity (not all actions belong with equal certainty - not necessarily to most water-tight, other analyses may break them apart)

periods of site-wide activity (line drawn across whole sequence diagram – depends on size of ‘the site’)

groupings between activity and period project-specific

Diagrammatic representation

strength of correlation

types of interpretative unit

length of unit life (stretched – land-use diagram)

phasing structure (e.g. as an overlay)